Worktable for grinding machines



OCt. 4, 1932. J ATH I WORKTABLE FOR GRINDING MACHINES Original FiledDec. 29, 1924 Patented Oct. 4, 1932 7 JOHN BATH, F WORCESTER,MASSACHUSETTS WORKTABLE FOR GRINDING MACHINES Original application filedDecember 29, 1924, Serial No. 758,559. Divided and. this applicationfiled.

February 27, 1930.

This application is a division of my prior application Serial No. 758,559, Patent No. 1,771,948 dated Feb. 5, 1930 filed December 29, 1924and relates to certain features in the construction of the sliding worktable shown in said prior application.

It is the object of my invention to provide a work table and other.similar sliding structure with guideways so designed that the tablewill be firmly held against the thrust of the wheel or against otherforces tending to lift the table from its supports.

A further object of the invention is to provide a construction in whichthe use of 5 clamps, gibs or other retaining devices is renderedunnecessary.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

. A preferred form of the invention is shown in the drawings, in whichFig. 1 is a partial plan view of a grinding machine embodying myimprovements; and

Fig. 2 is a sectional end elevation, taken along the line 22 in Fig. 1.

Referring to the drawing, 1 have shown a base or frame 10 of a grindingmachine having a supporting structure 11 on which a work table 12 isslidably mounted. The work W may be supported in any usual manner on thetable 12, as by a center 14 in a work driving head 15 provided with amotor 16. The work 7 is engaged by the periphery of a grinding wheel G,suitably supported on the frame 10 and rotated at high speed by drivingmechanism not shown.

The table 12 is provided near its front lower edge with a Hat finishedsurface 20, engaging a corresponding surface 21 of the supportingstructure 11. The structure 11 is also provided with a rear guidingportion 22 having converging upwardly and rearwardly inclined bearing.surfaces 23 and 24, the surface 24 being substantially undercut.

The table 12 is provided with a V-shaped downwardly extending projection30 having a surface 31 engaging the surface 23 of the supportingguideway 22, and the table 12 is also provided with a downwardlyextending Serial No. 431,949.

offset rear portion 40 having a bearing surface 41 engaging the undercutsurface 24.

It will be evident-that the table 12 may be placed on its supportingstructure by a simple downward and forward movement and that the tableisthereafter firmly supported for free sliding movement. The thrust ofthe heel G against the work W produces a force tending to move the workforward and to swing the table 12 upward and-forward about the frontedge of the front bearing surface 20 as a pivot.

Any such forward or upward swinging movement is effectively resisted bythe undercut guiding surface 24, which prevents any lifting of the table12'unless accompanied by a corresponding rearward movement of the tablein the direction predetermined by the undercut surface 24. Any suchrearward. movement would force the work W into closer engagement withthe wheel G, and no such rearward movement can be produced by theforward thrust of the wheel G.

While lifting movement of the table is prevented by the undercut surface24, downward movement of the rear portion of the table is equallyprevented by the portion 23 of the guideway 22 and the table is thusmaintained accurately in the desired plane of operation.

I am able to omit all gibs, clamps or other similar devices heretoforeused for preventing lifting of the table, and I am able to use a tablewhich may be placed on its support or removed therefrom with the leastpossible effort and without releasing or removing any attaching parts.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed,'otherwise than asset forth in the claims, but what I claim is 1. In a machine tool, asliding table and a support therefor, said support having a frontbearing surface adapted to resist downward pressure thereon, and havinga rear guiding member adapted to resist upward and forward pressurethereon, said rear guiding member having front upper and rear lowerguiding surfaces, with the front upper bearing surface inclined upwardlyand rearwardly and with the rear lower bearing surface undercut andinclined upwardly and rearwardly, said front upper and rear lowerbearing surfaces also converging upwardly and rearwardly, and said tablehaving three rlgid guiding portions maintained in fixed relation anddirectly engaging the three defined bearing surfaces of said support. a

10 2. In a machine tool, a sliding table and a support therefor, saidsupport having a front bearing surface adapted to resist downwardpressure thereon, and havinga! rear guiding member adapted to resistupward and forward pressure thereon, said rear guiding, member havingfront upper and rear lower guiding surfaces, with the front upperbearing surface inclined upwardly and rearwardly and with the rear lowerbearing sur- 6- face undercut and inclined upwardly and rearwardly, saidfront upper and rear lower bearing surfaces also converging upwardly andrearwardly, and said table having three integral rigid guiding portionsdirectly en'- 5 gaging the three defined surfaces of said support.

In testimony whereof I have hereunto affixed my signature. a I JOHNBATH.

